Welcome

Castle Island is located in Boston Harbor and is famous
for historically protecting the city from attack by sea

Castle Island Partners is a private equity firm founded in 2006 with a focus on providing both capital and valuable strategic resources to growing lower middle market companies.

Our experienced team brings the network of senior industry advisors, strategy consulting toolkit and key learnings from a long history of successful investments at larger private equity firms, applying these resources to companies that typically are not able to access them, given their size.
We partner with owners and management teams to help their enterprises successfully maneuver the challenges that come with growth or shifting industry forces.